1. Hard Glass:This part is made from Gg17 material. Sealed CO2 laser tube is usually made up of these three tubes, including the discharge tube, water-cooled tube and gas tube. The inside tube is the discharge tube.

2. Cavity section:This part consists of reflecting mirror and output mirror. The reflecting mirror of the cavity generally uses optical glass and silicon (Si) as the substrate and it adopts large curvature plano-concave resonator.

3. Electrode:CO2 laser machines commonly use cylindrical code cathode. The material of the cathode has a great influence on the life span of a laser machine.